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Business Segments (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Revenue from External Customer [Line Items] |  |  |  |
Total assets | $ 446,461 | $ 542,093 |  |
Cash and cash equivalents | 13,455 | 19,232 | $ 30,521 | $ 11,846
Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | 446,461 | 542,093 |  |
Cash and cash equivalents | 13,455 | 19,232 |  |
PE Films | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | 56,536 | 102,431 |  |
General corporate |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | 36,652 | 23,674 |  |
General corporate | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | 36,652 | 23,674 |  |
Subtotal | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | 396,354 | 499,187 |  |
Aluminum Extrusions | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | 255,756 | 293,308 |  |
Flexible Packaging Films | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | $ 84,062 | $ 103,448 |  |

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